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库姆组为一套极具特色的陆源碎屑—火山碎屑碳酸盐岩混积地层,又是一套典型的裂缝—孔隙型储层,岩性以泥晶生物屑灰岩、含砂生物屑灰岩、泥晶灰岩为主,部分段见泥岩、岩屑砂岩及凝灰岩。镜下观察库姆组碳酸盐岩储层孔隙类型多样,可分为原生孔隙和次生孔隙,原生孔隙有生物体腔孔及残余的粒间孔,次生孔隙有粒内溶孔、粒间溶孔、铸模孔、晶间孔及晶洞孔等。成岩作用主要有胶结作用、压实压溶作用、溶蚀作用、白云石化作用等,其中溶蚀作用和白云石化作用对该区储层孔隙发育具有重要的建设性作用。
The Qom Formation is a set of highly characterized terrigenous clastic-volcanic carbonate mixed sedimentary formations. It is also a typical set of fractured-pore type reservoirs. The lithology is characterized by clastic bioclastic limestone and sand Bioclastic limestone, mainly limestone, mudstone, lithic sandstone and tuff in some sections. Microscopic observation of the Qomu Formation carbonate rock reservoir pore types are diverse, can be divided into primary pores and secondary pores, primary pores have biological cavity and residual intergranular pores, secondary pores have intragranular dissolved pores, intergranular Dissolve holes, mold holes, intercrystalline and hole holes and so on. Diagenesis mainly includes cementation, compaction and pressure dissolution, dissolution and dolomitization, among which dissolution and dolomitization play an important and constructive role in reservoir pore development.